Summary:
Under the original Visser One's game plan for taking over Earth, everything was to be quiet. Secret. People would be convinced to become a voluntarily Controller through The Sharing, which preyed on their human weaknesses. Unfortunately, there's a new Visser One -- the former Visser Three, the only Yeerk to have an Andalite as a host.
Marco and the other Animorphs have noticed that the military has been massively mobilized, a lot of bases being set up in the surrounding area. It can only be one thing -- the new Visser One at work. It's up to Marco and the others to stop him -- before the secret invasion of Earth becomes all out war....
